Zsolt Kovács, Zsolt Janos Viharos, János Kodacsy, Roland Sándor
The goal of the reported research was to evaluate the machining conditions the magnetizable and non-magnetizable materials by the novel permanent Magnetic Assisted Ball Burnishing (MABB) tool. C45 steel, KO36 austenite steel, AA7075 aluminium and PA6 polymer materials were applied in the experiments. The main aim was to determine the optimal the technological parameters for these materials taking in consideration the hardness and roughness of the surface, too. Taguchi design of experiment methodology was applied in this study to simply look for optimal technology, compared to other kinds of...
TC10 Conference 2019
· TC10
· 2019
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Domenico Capriglione, Marco Carratù, Marcantonio Catelani, Lorenzo Ciani, Gabriele Patrizi, Roberto Singuaroli, Paolo Sommella
MEMS-based Inertial Measurement Units are today widely employed in many contexts. Especially in the field of self-driving vehicles and navigation they provide important information to the electronic control units for implementing positioning, localization and tracking algorithms. As a consequence, it becomes important to analyse the accuracy, reliability and time to failure of such systems when operating in conditions as more as possible similar to ones experienceable in the practice. To these aims, in this paper we investigate on IMU performance under random vibration which can be thought...
TC10 Conference 2019
· TC10
· 2019
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Balázs Scherer
Statistics show that more and more cyber-physical systems are using RTOS (Real-Time Operating System). RTOS based system software can introduce multitasking and real-time behaviour based errors. Therefore, the testing processes of such systems should address the detection of these possible errors. Unfortunately, the multitasking and real-time behaviour based errors are among the hardest to detect. The best way for the detection is to perform extensive testing in a very realistic environment like in a HIL (Hardware In the Loop) simulation. These environments provide the possibility to perform...
TC10 Conference 2019
· TC10
· 2019
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Bikram Chaudhuri, Sayfe Kiaei
This paper gives an over view of the Delta-Sigma (∆Σ) converters for wireless applications. First an overview of data converters is presented, followed by Fractional-N frequency synthesizers. The aim is to give an overview of the subject, and present sufficient level of detail while covering all essential aspects.
David J. Allstot, Jianjun Guo, Ward J. Helms, Waisiu Law, Charles T. Peach
The digital calibration algorithm for conventional 1-b/stage pipelined analog-to-digital converters introduced by Karanicolas et al. [1] occasionally leads to missing or non- monotonic digital codes. In this paper, we show that an extension of that algorithm to 1.5-b/stage architectures actually leads to more frequent code errors. We also describe two methods to improve A/D performance in the presence of non-linear operational amplifiers. The first method uses a calibration that assures monotonicity in the presence of arbitrary comparator offset voltages. The second method employs an...
Sebastien Fievet, Sirag Gokoglu, Emmanuel Marais, Roberto Rivoir
In this paper, considering as driving example an analog base-band processor for mobile communications, integrating complete A/D and D/A data conversion based IPs, as transmit/receive base-band ports, voice-audio codecs, auxiliary codecs, we will present an overview of a number of design-for-test, modeling, simulation, and test strategies, aiming to ensure both a complete and economical test of the chip. Our goal will be not only to highlight the effectiveness of a synergic deployment of techniques, like analog design-for-testability (DFT), design modeling, statistical analysis, correlation...
Yann Deval, Dominique Dallet, Jean-Baptiste Bégueret
A general overview of radio receivers and transmitters is presented. Introducing the principle of frequency translation, classical heterodyne and homodyne RX and TX architectures for analog telecommunications are discussed. Digital telecommunications are addressed and, with them, modern polyphased transceiver architectures and the insertion of an ADC within the receiver chain. First the ADC is considered at the baseband level, then at higher frequency stages, and up to the antenna yielding to the ultimate Software Defined Radio (SDR) principle. At each location of the ADC within the receiver...
Yang Cai, Yongxiang Hu, Mel Siegel, Sriram Janakiram Gollapalli, Ashish R. Venugopal, Ulas Bardak
The purpose of the onboard feature indexing system is to perform pattern recognition and data compression onboard. We use the unsupervised machine learning algorithm k-means to classify the lidar profile data and generate an index dictionary. Then we train the Radial Basis Function neural network with the index dictionary on ground computers. Finally, we use the same RBF model for the onboard feature recognition and indexing. We implemented a prototype of the onboard computer with ZISC (Zero Instruction Set Computing) chips and FPGA (Field Programmable Gate Array) so that it takes advantage...
S. Caorsi, M. Donelli, G. L. Gragnani, A. Massa, M. Pastorino, A. Randazzo
Among the various imaging systems, the ones based on electromagnetic waves in near-field conditions are considered in this paper. In particular, two reconstruction approaches based on stochastic concepts are discussed. Starting from tomographic configurations, the integral equations of the inverse scattering problem are discretized and solved by using a genetic algorithm and a simulated annealing. The effects of the presence of the so-called nonradiating current are also taken into account.
G. Tognola, C. Svelto, M. Parazzini, P. Ravazzani, F. Grandori
A simple but robust and efficient 3D laser scanner was developed for data point acquisition from an object surface. The system is mainly developed for digital registration of anatomical parts to be used in biomedical applications. A novel surface reconstruction algorithm is adopted to obtain an explicit 3D model for the measured object with adequate ease and accuracy. Some of the practical applications of this contact-less scanning system, as well as its first step metrological validation are presented.